It's revealed in this one that the Lane's phone number is 624-1098.
This was the first episode filmed in Hollywood.
This episode marks not just a new opening sequence and new version of the theme song, it also is a completely new set due to the show moving from New York City to Hollywood. The entire interior layout is different and the exterior shots are of a different neighborhood. This is never addressed.
This is the second of two appearances Frankie Avalon makes in the series, each time playing himself. The first appearance occurs in How to Be Popular (1963).
Several of the vignettes appearing in the running of the opening and closing credits were taken from scenes that play in this episode. The one scene in which Patty gets her head stuck between drain pipes has been edited, however, to exclude Frankie Avalon's face.